Sodium Chloride → HCID 22724535, compound

A mixture of tetrahydro-2H-pyran-4-amine (5.0 g, 49.4 mmol, 1.0 equiv.) and potassium isocyanate (4.0 g, 49.5 mmol, 1.0 equiv.) was refluxed in H2O (50 mL) overnight. The reaction was cooled to room temperature and excess NaCl was added to help saturate the aqueous layer. The precipitate was isolated by filtration to provide the desired product (1.28 g, 8.88 mmol). The aqueous layer was washed with EtOAc (3×15 mL) and then was concentrated and azeotroped with toluene (3×100 mL). The resulting solid was suspended in 1:4 CH3OH:EtOAc (100 mL) and filtered a total of four times. The combined organics were concentrated under reduced pressure and combined with the isolated precipitate to provide 5.01 g (70%) of the title compound. LC/MS: m/z (ES+) 145 (M+H)+. 1H-NMR (400 MHz, DMSO-d6): δ 6.14 (d, J=7.5 Hz, 1H), 5.47 (s, 2H), 3.85 (dt, J=11.6, 3.6 Hz, 2H), 3.65-3.52 (m, 1H), 3.38 (td, J=11.4, 2.2 Hz, 2H), 1.80-1.72 (m, 2H), 1.42-1.27 (m, 2H).

1. concentrationto help saturate the aqueous layer
2. customThe precipitate was isolated by filtration

ORD record

ord-74beb1980fff480ea97d1f44f5f0b7a8

Source dataset

uspto-grants-2015_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09181200B2